导出数据表SQL,通常我们会使用第三方工具,如Navicat等,导出可保存为脚本,可重复执行,相当方便了。如果不要求脚本灵活性,使用工具当然更香了。
第三方包
<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.5</version></dependency>
数据库配置
创建db.setting文件,放 /resources 文件夹即可,支持多数据源,定义多个 [xxx] 即可
## 数据库连接信息
[test-db-dev]
url = jdbc:mysql://xx.xxx.xxx.xxx:3306/test_db
user = root
pass = xxxxxx
脚本
importcn.hutool.core.collection.CollectionUtil;importcn.hutool.core.io.file.FileWriter;importcn.hutool.core.text.StrBuilder;importcn.hutool.core.util.ObjectUtil;importcn.hutool.core.util.StrUtil;importcn.hutool.db.Db;importcn.hutool.db.DbUtil;importcn.hutool.db.Entity;importcn.hutool.db.ds.DSFactory;importlombok.Data;importlombok.SneakyThrows;importlombok.experimental.Accessors;importjava.io.File;importjava.util.List;/**
* 生成的sql:删除表 + 创建表 + insert
*
* @author jason
*/publicclassCreateAndInsertSqlJob{privatestaticfinalString FILE_NAME="/data/sql/【系统生成】删除表+创建表+insert.sql";/**
* 需要生成的表
*/privatestaticfinalList<TempBean> CONFIG_LIST=CollectionUtil.newArrayList(newTempBean().setTable("table"),newTempBean().setTable("table").setCreate(false));/**
* 不需要生成的字段:如虚拟列
*/privatestaticfinalList<String> filedIgnoreList=CollectionUtil.newArrayList("","","");publicstaticvoidmain(String[] args){CreateAndInsertSqlJob.start("test-db-dev","test_db");}/**
* 生成 sql
*
* @param dbSetting 配置名 如配置:[test-db-dev],这里传 test-db-dev
* @param dbName 数据库名
*/@SneakyThrowspublicstaticvoidstart(String dbSetting,String dbName){Db db=DbUtil.use(DSFactory.get(dbSetting));FileWriter sqlFileWriter=FileWriter.create(newFile(FILE_NAME));
sqlFileWriter.write("");
sqlFileWriter.append("USE "+ dbName+";\n");
sqlFileWriter.append("SET NAMES utf8mb4;\n");
sqlFileWriter.append("SET FOREIGN_KEY_CHECKS = 0;\n");for(TempBean tempBean: CONFIG_LIST){String table= tempBean.table;
sqlFileWriter.append("\n\n\n");if(tempBean.create){// DROP TABLE
sqlFileWriter.append("DROP TABLE IF EXISTS `"+ table+"`;\n");// CREATE TABLEEntity createTableEntity= db.queryOne("SHOW CREATE TABLE "+ table);
sqlFileWriter.append((String) createTableEntity.get("Create Table"));
sqlFileWriter.append(";\n");}// 看配置,是否需要insert语句if(tempBean.insert){// INSERT INTOList<Entity> dataEntityList= db.query("SELECT * FROM "+ table);for(Entity dataEntity: dataEntityList){StrBuilder field=StrBuilder.create();StrBuilder data=StrBuilder.create();
dataEntity.forEach((key, valueObj)->{String valueStr=StrUtil.toStringOrNull(valueObj);// 看配置,某些列不需要if(filedIgnoreList.contains(key)){return;}
field.append("`").append(key).append("`").append(", ");if(ObjectUtil.isNotNull(valueStr)){// 值包含 ' 转义处理
valueStr=StrUtil.replace(valueStr,"'","\\'");// boolean 值处理if(StrUtil.equals("true", valueStr)){
data.append("b'1'");}elseif(StrUtil.equals("false", valueStr)){
data.append("b'0'");}else{
data.append("'").append(valueStr).append("'");}}else{
data.append("NULL");}
data.append(", ");});
sqlFileWriter.append("INSERT INTO `"+ table+"`(");String fieldStr= field.subString(0, field.length()-2);
sqlFileWriter.append(fieldStr);
sqlFileWriter.append(") VALUES (");String dataStr= data.subString(0, data.length()-2);
sqlFileWriter.append(dataStr);
sqlFileWriter.append(");\n");}}}
sqlFileWriter.append("\n\n\n");
sqlFileWriter.append("SET FOREIGN_KEY_CHECKS = 1;\n");}@Data@Accessors(chain=true)staticclassTempBean{/**
* 表名
*/publicString table;/**
* 是否需要 create 建表语句,默认需要
*/publicBoolean create=true;/**
* 是否需要 insert 语句,默认需要
*/publicBoolean insert=true;}}